I'm certainly no expert when it comes to this type situation. I do remember this case:

https://www.nbcmiami.com/news/local/20-years-later-fbi-agent-behind-elian-gonzalez-controversy-tells-his-story/2049744/

Different fact pattern, but it did involve international family court with a country that lacked ties to the US.

I agree that a Florida lawyer could possible provide some insight.